Václav Jeřábek (1845–1931) was a Czech

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

, specialized in constructive

geometry Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is c ...

Life and work

Jeřábek studied at the lower school of

Pardubice Pardubice (; german: Pardubitz) is a city in the Czech Republic. It has about 89,000 inhabitants. It is the capital city of the Pardubice Region and lies on the Elbe River. The historic centre is well preserved and is protected as an Cultural monu ...

and at the higher school of

Písek Písek (; german: Pisek) is a town in the South Bohemian Region of the Czech Republic. It has about 30,000 inhabitants. The town centre is well preserved and is protected by law as an urban monument zone. Písek is colloquially called "''South ...

, then he was to

Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...

and studied at Imperial and Royal Polytechnic Institute where he graduated. Although he participated in several leading intellectual circles of Vienna, he remained a Czech with a clear view of patriotism. He began his teaching at the ''Realschule'' of

Litomyšl Litomyšl (; german: Leitomischl) is a town in Svitavy District in the Pardubice Region of the Czech Republic. It has about 9,900 inhabitants. It is former bishopric and Latin Catholic titular see. Litomyšl is known for the château-type castle c ...

(1870), being transferred two years after to the ''Realschule'' of Telč. In 1881, he was appointed professor of the ''Czech Realschule'' in Brno, and became its director in 1901. He retired in 1907, and suffering of a cataract, he died almost completely blind, MacTutor History of Mathematics. in 1931. Jeřábek was one of the men who kept the Czech geometry at the scientific level. He published scientific articles in Czech, German and French, and longer lectures. He is well remembered by the Jerabek hyperbola, the locus of the isogonal conjugate of a point that traverses the

Euler line In geometry, the Euler line, named after Leonhard Euler (), is a line determined from any triangle that is not equilateral. It is a central line of the triangle, and it passes through several important points determined from the triangle, inclu ...

of a triangle. He was honorary member of the Union of Czech mathematicians and member of the scientific societies of

Moravia Moravia ( , also , ; cs, Morava ; german: link=yes, Mähren ; pl, Morawy ; szl, Morawa; la, Moravia) is a historical region in the east of the Czech Republic and one of three historical Czech lands, with Bohemia and Czech Silesia. The me ...

and

Bohemia Bohemia ( ; cs, Čechy ; ; hsb, Čěska; szl, Czechy) is the westernmost and largest historical region of the Czech Republic. Bohemia can also refer to a wider area consisting of the historical Lands of the Bohemian Crown ruled by the Bohem ...

References

Bibliography

* * *

External links

* * {{DEFAULTSORT:Jerabek, Vaclav 19th-century Czech people Austro-Hungarian mathematicians 1845 births 1931 deaths Czechoslovak mathematicians